Comparison of the effect of different types of experimental anisometropia on stereopsis measured with titmus, randot and TNO stereotests

Purpose: To assess the effect of experimental anisometropia and monovision on stereopsis using the Titmus, Randot, and TNO stereoacuity tests. Methods: Sixty adult volunteers were enrolled in the present study. Four different types of anisometropia—myopia, hyperopia, and astigmatism (both 90° and 45°)—were induced by placing trial lenses over the dominant eye (from 3 to 1 D). Stereoacuity was measured using the Titmus, Randot, and TNO tests. Results: In all the anisometropia types, stereopsis deteriorated with increase in anisometropia in the three stereoacuity tests performed ( P Conclusion: Any type of anisometropia may reduce stereoacuity; this reduction is most noticeable with myopic anisometropia, especially in the TNO test, probably due to the lack of monocular cues.